Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a013036894c8ef09a558721a8d30fcb64703e0be8b366810be69e1ce02ab575' 
  AND token = 'LtnV7/wLQmr6IIQnxfxd+7XThmMsBCa/K/xmTMDeoDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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