Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ec78a2509b0a3f58b8c9d94450b6782431c81016ac44a6e2b1eb23ca3cc5bd' 
  AND token = 'lsGyaq4CuyTajC9QsL1KWqkiwCP3Cx7LLc8z7P+QM6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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