Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '109ce134fadbe9ae6a65f26f53c30bf4df0e6ad088f25c92bc570d722cac3cca' 
  AND token = 'gMc27ws5FpzATTHBvZsgDhZDaFcl/68dKZrhJxmOOPA=' 
  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"
    }
  }
}