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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f71e61453b4ebe7a72515eeef2af856ba2b8d457f53e1339af0d4e093964442' 
  AND token = 'A02tPMyKoYzf9jL7EroLKHgCl60dk9Q4e2vRo8oLEkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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