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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b6425390b4af64835c12d27e4ccd2e8d85905c5de75ccfb76ef768597c607e9' 
  AND token = 'USLJUZiVW8ePx/Srt8buEBoAoUFv4Bfy1lZ1DZ4LPng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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