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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54c3e70938449ddb9881335e1c6d9e789da04d815568e352dd3c2583f3763883' 
  AND token = 'ENmRrmv701cFTfLFZqi5M7r1VQkcTTmvdlfrKZ3hGkU=' 
  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"
    }
  }
}