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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799e43fca766f5bd1a750fb0b1c6f2ca5c80fd0edd11c0f0967cdda228a3aa9c' 
  AND token = '9rT+aCmKWiiywOv7I1pxhfuIC4MYu2cE9dWWdgnJWL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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