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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '992c4182b028fc4111f40a4f0389f01b427e4b1712a8ee1588b93b5cf44c70d6' 
  AND token = '0dbfj3dWLgUEo80+P3DPaPc+iNfaF7XhfHBOdkQOUhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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