Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eff9885337491bd72a1e2b236e74d2b0a7fa566899fdd17735bcedcf2665dd59' 
  AND token = 'NGdg0VCr2TttWcYLIYCyCZjcfmB53ck3eSzbLYjikx4=' 
  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"
    }
  }
}