Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5adfd461ea5ef003283c44e9a0ed016d08e4aec2212bd26ac83e18ba7e22e67' 
  AND token = 'IjjSGNQDt21nR40xShhXAZsfB7AIT2JqvL9lnwkvDJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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