Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8daaa1a11830dd0d078fdda8d25f2f78ef03f4d575d62e31feba3ce5ddf7dab' 
  AND token = 'Ddxpfni87Amr1Ce/cJ6Uwp6KX2pG1FFysBX8euP3NEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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