SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c30bfa65b8c76afd7f76e2d9626f296eaca748c13cf5d7cdd2ba5611482ff76' 
  AND token = 'YX78FbVGvIodT9tmBIkX04GVfhsR3l/Hm7KUjHYDh2w=' 
  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"
    }
  }
}