Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd28ca9b45e9d679246eab515718591ff355e28d0493e1250929e2dca85134a' 
  AND token = '3f2tMcKh/V0D0Zpm1PPmvomO0aiOX0QnExIH0/Y9uVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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