SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c7d2f521624029dd4edda8b3d77b5a58051a895c9497d32a3a5fed7c0dd0e8' 
  AND token = 'IimSSJ/2qp+2BwFrzTTshLDnk+l6VeYRlOgve//XpsE=' 
  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"
    }
  }
}