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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a1f5b5cb4274203717a66518647811c9ec885d0ff0a575988ef9e155bd072b5' 
  AND token = 'CxvacqC5TkesyGDu56lBu30MifA9X1YPJQhx3xVfOQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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