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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd9282e86a8bcf01ff19836a297f3a0e23b572beaa9bac90a014233c57a2a58' 
  AND token = 'W65y0RAvfDPcipj9nFjtdw9xxfBC14MPatm2aCUZpcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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