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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e00d035e5f813d399ed52cd0020a53fd63b15b42575172fac5874b1196060a' 
  AND token = '4TbtSQv1LiGFuAkpBgTywRFd+S3d4CZybwWIND8iuLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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