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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e88cf1df2e88e0700b4d4fc6ba96a45a99101b952166cf28939044f6118a7b93' 
  AND token = 'Ul2dRGsk2cHIWG4wFx1HDElo5o6AKf+zdclCV+zb4cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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