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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a3ec9b21fc81acd623e5f484a82bf5ebbf68897c2fd7d5bad86763fdf06a32' 
  AND token = 'QHApdK8eAEiT+lUQ42aek15XYOL4jWGzZnJF5a9/V4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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