Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b096c9c7e211aa5c176910ca738fe99dce77573ce384c47e2f5da88266c65456' 
  AND token = 'l5uJa/grxgpZX4EBl1e1Ki07+TvDoGRSKgBvtntirT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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