Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fee2c2c5f959bec47aa690ecff63d433745ba165cfdb87beebfe65954117432' 
  AND token = 'CzdUaNFbckaQrIN3K/KXKgHEySRTzA3/lY2rSIE78JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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