Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '899ef251ec3ee6973d1dfa6e5b804f8b36da3ba44168b3e66e112a50c8060bb0' 
  AND token = 'Qs3+CdxqE8Ep/WXs7RN4pj2FJyERkg5ZiUKDXxwdF4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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