SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2005fbe8483b437ba049e1cbdbe68b975c6eb29d61224681e587da83d54a2974' 
  AND token = 'F8WUSeUG9KrdGxCoKhzAKDEPrjYvuQrze/V1hjr5uYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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