Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5546eab0cbbf426d24e229c0c2a8a471bf1e05a98b8c3e805380c37365ad9310' 
  AND token = 'no6Nce8k3DUqeesM++FFxeWSd1O+ITLS5KTSmYqM59I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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