SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '446fe681112cd989e58539b5a61f62fa0ce6082f27d33b363bd09673bd37e628' 
  AND token = 'euXIGQ/FOoZQ0htk/8Ytj+aDgT5U7BxFEvYUb0AiWJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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