Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed2fdc8e0029c5094c83daf1e0299c90dba7616d00b8fa1a6bfe990d3a653102' 
  AND token = 'A4WyLsiq8qV764eMoa9mE5ZOEyQDi+FA/L8+M3Xe9pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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