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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f631a579c71dca38f8b9bd602c9e9956afccfad954dee5c91bbb2e2c3054f5d' 
  AND token = 'YQX3pbQmbZXvqVawuSuDL/B0KE2IcLRvdx0pU8HOsWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}