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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdf3e05a167d4b694b67885c924d24f0c49c6d63af2b89199805dd38235d8953' 
  AND token = 'VJwe4UqdO4SMO1UfyAd5IWM1NOuUEzS5MMlO5zxkMd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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