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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfcfefd76e0518e9efe1fd1c540ffa48605248256595ddf0cc957cb7b6b00e1c' 
  AND token = '2ZRyKj1eAoPplpT0GQrKHTYgo8zr9g2AMoOvmGKD3Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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