Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2810be28a0a330d8dc40f4d5bb17d536b9e435f14e8aff408a14384826f0d710' 
  AND token = 'HqEA8oudBoUPBRp8LjPQysOkqGBT3uewhbsWtB/ATOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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