SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82dbbcafa1eed9496f983bd6ee635a866cbca5f01359a25f58b09b066717456e' 
  AND token = 'YxN0shuq72BIHawngLkU2izEOEocWXpv+rvIGFvzzMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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