Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04b48453a2e07205e99ee9a78efd395023bcd80d2589fe1a7c407629f6eb1eb' 
  AND token = 'rvWeCREiQj928t1KjGVAuB0omzyLU3AssmGaETRpkuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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