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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61959f5f4b7e2a7d96a6df8f08c990d93dd77381f46ed67082e25d5d9f63c6c9' 
  AND token = 'FG3u5+aITcuNWd5Bgm2eweM/09YhHMNIAJwHUj36XI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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