Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f82704123a49cfd60a2e9455aded2ffd1946da613b6741bd36e86033be8d0a' 
  AND token = 'dQZvRMuMNP5g4LXWHXfx6nAceEc7/sLL9uRqqPaO8K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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