Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e67e2a8852b7dd451c198a818d13b80ce72d580c35a72057169de2d5540f154c' 
  AND token = 'b9hy3gRhYVcTxi4UTOy0EemslpUelqha/pUjWZqln2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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