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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7ba8ef7775d663af0d13a95489b9f8c90c8bff75f9f7701d250565781456fe2' 
  AND token = '1EQZZ3OAd02R3iiScg3+tIg/WJYhkz7ZD40P4YQEdQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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