Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e14362b72ad1fb5b03f128f9685cc7c98078b4004af393a451a45734d5085014' 
  AND token = 'aXtI1Jxt5HxiRL0gEaSO7OfDtDPpIm+Rg4veJfTDGXA=' 
  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"
    }
  }
}