Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de8df47c99829965e5250bc6de6483749ac64963eb646f86d71e8507f8677bea' 
  AND token = '+xMnSLmrMpbqwsu12iNYONCFfxtNtChWEeqizmq8rbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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