Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e752bbc5c4d29045611ec6eec29050b6fa7dcc6eb9bfd7232055595bf9b6d9db' 
  AND token = '6URE/xyWTtisa7m+xbb0k2gCxNXGgWAyCKwO/dUrEJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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