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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '146e9b283ffd1f9681b3ff2fe10cc07bc6a412536143049e02988824147e7826' 
  AND token = 'zAskPrbbPmfdr0rvmC9uTcCB/9I889VCxS0uzQRv1Xc=' 
  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"
    }
  }
}