Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdf83bdeea8536d01fe2ce0ad7c5ff6635c87c15df5591b21cb6956c104f9bcb' 
  AND token = '852kn/btFWbZF8diZ59mXHC76w0LEKOD8xXwwAAwtUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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