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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edee65dff9ff0904ac95ea9b6ffec12bf61dde1add5d12adf37889c4d31cf8b0' 
  AND token = 'doQIIXeNn0FNIJHddj2Yj/HvFZa8BjfnXBVlFN8wfSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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