Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8fdc75830d41f7a012e56910b4897e48e5b433f9921f5340d292d95f583f4e5' 
  AND token = 'VvUsaceGiqkrVaMR+8RZ8LJ5EPusbvEdoPNCZ3Zwdz4=' 
  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"
    }
  }
}