Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8712d57000df7b6c6f49b6bf5370b4df330536b29dae3ff4f23062a422637e' 
  AND token = 'DHzF5qVtn6ATPqkvjT9FeizjKfB4NhFIsveLlyPCnHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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