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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f699c156f5d74f653823b5ae1491fe55d118727bc249f7d75a8588c51f595e58' 
  AND token = 'AYJ8/l8T5N9h6c39915OzIsGzBs9cvwPTxFgKuVITUc=' 
  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"
    }
  }
}