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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ad97baf091835bc29ac907367055142850c2b5cc2439f211868b335d57f3f3' 
  AND token = 'yZn0Wbt4xlzbjm7JFId3OIDpWuwx9csZNuHS+scAr3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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