Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ac9dee9cbf2c1dc9bc1805a270659d2714d8fac2e715b938482547f8c8b48e' 
  AND token = 'u7Ugm9zdIssVAaz9OyjZ1cEsA1pH0OePTcd55YU5/UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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