Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab1d503a1df9dca602b349178c8b1eda3e79a74a5b9252decef4501735519ff9' 
  AND token = 'GxQC0MZ74Hzt4gK5kePG+bb+Rr8IoMFC3aieOQzUp5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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