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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8108dc1c5d6c48f5795f768f908f94762ea85319e341c28d4b960ab3b9bb620a' 
  AND token = '83L5nBOEYBWF3yCniHYmEFiGPvHzIQDQPeRrrF1sKPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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