Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8a1f5675a8b9b1ce0e0ce8edb6bae447faaebad9d8c90e6fa51073871a90d57' 
  AND token = 'Uu6qOVNM+slImJmlR/m80WRaBqPGQYJQKWqI2Pe3fuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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