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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d864fd4f1aa9921a5baff9b9dde5bac7f5f4ac41bf6cdba71f09d3818fb9f4' 
  AND token = 'xQQbpiOsK1mfH3uGRntZJV7QxV9smoPU66zhfSWpaZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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