Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb8b83786d33bc0589fbfa660e4a97cf2be45294e03d42dc8f756e656ed271d1' 
  AND token = 'm4X2pBogkcBtK9NSSRj60dBqH28ZtH2wApT2agFuQQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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