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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c25cda47079a458592db080adb0fa298e113b098b0a65aef97bdc94d02aaaf1d' 
  AND token = 'RDz6jsf+v3y7O+5/WxR7fAetOyq4UYsk7LOVXEHVNqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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