Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd5b560956c4e3e0a6e52718bef908e82a8a2a83817d967833619509ee361169' 
  AND token = 'abQ9wopxZlo1q6t1njv7/VWD6+uqo8UQPk89+C4M8TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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