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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '143b27503ec0e486df2ac28f4204bce596915ba07d4393db57d789cfed0ac5d2' 
  AND token = 'Rndtl5qMvY0QlxJrvaji4oGIgPj5Cv+pdOchckDZ9a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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