Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f86b48e844112e4b7fb96bdaaa429da4c68af606c814752d621537c7f49d5a5' 
  AND token = '9UODGUd4MsGNXOINJK1DPc1fvMILLw9q7nHmf1/5nhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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