Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5ade8c67f67e98561173c0e433a70a4dc505843442a1d032d56dcea3b358f6f' 
  AND token = 'V5m4PBlIqC9e4qrhwp5jhZovnwu/SB4Ic3mqPwjjaIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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